Energy-gap reference circuit

A technology of energy gap reference and reference current, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of differential temperature coefficient and PSRR characteristics, bad power supply rejection ratio temperature coefficient, etc.

Inactive Publication Date: 2008-08-13
FARADAY TECH CORP
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  • Summary
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Problems solved by technology

This drain-source voltage mismatch is quite sensitive to power supply and temperature, which will result in a poor power supply rejection ratio (PSRR) temperature coefficient
[0008] For this reason, it is desirable to have an improved technology of the energy gap reference circuit, which can improve the shortcomings of the existing conventional technology, that is, poor temperature coefficient and PSRR characteristics

Method used

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Embodiment Construction

[0028] In order to make the content of the present invention clearer, the following specific examples are given as examples in which the present invention can actually be implemented.

[0029] In the embodiment of the present invention, in order to improve the mismatch of the drain-source voltage of the MOS transistors of the current mirror in the prior art, another operational amplifier is used to make the drain-source voltage of all MOS transistors in the current mirror- The source voltages are substantially equal to each other, thereby reducing circuit errors caused by channel length modulation effects.

[0030] Please refer to FIG. 2 , which shows a circuit block diagram of a bandgap reference circuit according to a preferred embodiment of the present invention. The bandgap reference circuit includes: a current mirror 210, an operational amplifier OP21, a bandgap current generator 220, a feedback circuit 230 and a load R2.

[0031] The bandgap current generator 220 is use...

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Abstract

The invention discloses an energy gap reference circuit comprising: a reference current generation circuit generating a first and second reference currents on a first and second current paths; a current mirror generating a third reference current on the third current path based on the first and second reference currents; an operational amplifier to make the first reference current equal to the second reference current; and a feedback circuit to make a mode voltage on the first current path equal to a node voltage on the third current path, to eliminate error caused by probable channel length modulation effect of the current mirror.

Description

technical field [0001] The invention relates to an improved way of the energy gap reference circuit, which can improve the electrical characteristics of power supply rejection ratio (PSRR) and temperature coefficient of the energy gap reference circuit. Background technique [0002] A digital-to-analog converter (DAC), an analog-to-digital converter (ADC) or a regulator requires at least one fixed and stable reference voltage. This reference voltage is preferably regenerated stably each time the power supply is turned on. The ideal reference voltage should not be affected by process variation, operating temperature variation, and power supply variation. [0003] A bandgap reference circuit may be used to provide a reference voltage. Therefore, in many electronic systems, the bandgap reference circuit plays an important role, because it will determine the overall stability and accuracy of the system. [0004] Generally speaking, a bandgap reference circuit includes several...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/28
Inventor 彭彦华王为善陈美秀
Owner FARADAY TECH CORP
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